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. 2019 Dec 13;86(1):e01907-19. doi: 10.1128/AEM.01907-19

TABLE 1.

FT-IR band assignments of E. coli

Wave no. (cm−1) Functional group assignment
∼3,200 N-H stretching of amide A in proteins
2,955–2,850 C-H asymmetric stretching of -CH2 and -CH3 in fatty acids
∼1,637 Amide I of beta-pleated sheet structures of proteins
1,550–1,520 Amide II band of proteins
1,468 C-H deformation of CH2 in lipids
1,415 C-O-H in plane bending in carbohydrates, DNA/RNA backbone, proteins
∼1,400 C=O symmetric stretching of COO group in amino acids, fatty acids
∼1,355 Wagging vibrations of methylene fragments
1,310–1,240 Amide band III components of proteins
1,250–1,225 P=O stretching asymmetric of PO2 phosphodiesters in phospholipids
1,084 Stretching P=O of phosphodiester, phosphorylated proteins, or polyphosphate products
900–600 Fingerprint region